I'm totally fine with the current number of companions, provided that they will truly distinguish themselves through dialogues, personal side quests, interactions etc., to have a couple more of them would be great, obviously, but I can wait to see them in a DLC. Wilderness areas yes please!!
Also adding new stretch goals is a good idea, that could mean that the dev team already has ideas for new content they would like to put in the game, that hopefully would make it better in the end, and feel confident to ask for more funding in able to do it. So yes, please do.